this is the one i like
Blue Dot Stingray - Taeniura lymma
Also known as: Stingray, Blue-Spotted
Maximum Size: the Taeniura lymma grows up to 14 inches.
General Size Specifications: The Blue Dot Stingray will come to you generally between 7 - 14 inches.
Minimum Tank Size: The Blue Dot Stingray prefers a tank of at least 130 gallons with plenty of places to hide & swim.
Diet: The Taeniura lymma is a carnivore and likes to eat variety of chopped crustaceans, fish pieces, shrimp, shellfish, squid.
Level of Care: The Blue Dot Stingray is a high maintenance fish.
Behavior: The Blue Dot Stingray may act peacefully toward other fish. THIS FISH IS VENEMOUS. Severe reactions can occur if allergic. If stung soak injured area in hot water and seek medical attention.
Hardiness: This is a hardy fish.
Water Conditions: Keep water quality high (SG 1.020 - 1.025, pH 8.1 - 8.4, Temp. 72 - 78° F).
Range: Indo-Pacific.
General Notes: The Blue Dot Stingray prefers a tank of at least 130 gallons with plenty of large open sandy areas free of sharp objects. Likes to hide in deep substrate. Sharks & rays should never be exposed to copper-based medicine. Will be shipped 7 - 14 inches.
though as you can see you have the very minimum recomended tank size.. well just over there are others but i can think of any that are small enough right now